Screw. Team Members: Total Points. Progression: Applications in Design & Engineering - Section 6. Student Engineering Workbook. /30 pts.

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1 Screw Progression: Applications in Design & Engineering - Section 6 Team Members: Student Engineering Workbook Total Points v Workbook: /30 pts Challenge: /30 pts Key Terms Match the key terms that are listed in the word bank with the correct definition. Write the correct letter in the space provided. 1. The distance around a circle. 2. Using a force to move an object a distance. 3. An inclined plane wrapped around a cylinder that converts rotary motion into linear motion. 4. The distance from the center of a circle to the outside edge. 5. The object or weight being moved or lifted. 6. A push or a pull. 7. An irrational, infinite number ( ), that represent the ratio of a circle s circumference to its diameter. 8. The resistance that one surface or object encounters while in contact with and moving across another. 9. The distance between threads on a screw. 10. A device that transmits or modifies force or motion. 11. The distance through the center of a circle from one side to another. Key Terms A. Simple Machine B. Screw C. Screw Thread D. Screw Pitch E. Friction F. Mechanical Advantage G. Radius H. Diameter I. Circumference J. Pi K. Force L. Work M. Effort N. Load 12. A force applied to a machine to do work. 13. The amount a machine multiplies force. 14. The raised ridge going around a screw. 1

2 Learn, Build & Modify Elements of a Screw Identify the correct element in the spaces provided Purposes of a Screw List the two purposes of a screw in the spaces provided. 17. Purpose : 18. Purpose : Real World Application Research some real world applications of the screw. In the space provided, write two examples not found in the curriculum packet Build and Modify Place a check in the boxes below as the team completes each step. 21. Build and test screw model. 22. Modify and test screw model. 2

3 Build & Modify Understanding Mechanical Advantage Fill in the blanks in the statements below. 23. Mechanical Advantage exists when the force of a machine is than the force that was applied to it. 24. For a machine to create mechanical advantage, it must trade increased time or for reduced effort. Attributes of a Circle Write the correct answer in the spaces provided below. 25. Calculate the diameter of the circle in example 1. Diameter: 26. Use the formula to calculate the circumference of the circle in example 1. Circumference Diameter Example 1 Radius (15 cm) Circumference: 27. Calculate the radius of the circle in example 2. Circumference Formula C = 2 π r r = radius Radius: Circumference Example 2 Radius 28. Use the formula to calculate the circumference of the circle in example 2. Diameter (20 cm) Circumference: 3

4 Build & Modify Calculating Mechanical Advantage in a Screw Use the formulas to solve the problems below. Example 1 - ScrewExample B 29. Determine the mechanical advantage of the screw in Example 1. Mechanical Advantage: Mechanical Advantage = Formula Circumference of Screw Pitch of Screw 22.5 cm 1.5 cm 30. Determine the mechanical advantage of the screw in Example 2. Mechanical Advantage: Mechanical Advantage = Formula Circumference of Screw Pitch of Screw Example 2 - Screw 37.2 cm 2.5 cm 4

5 Design & Engineer Design & Engineering Challenge Follow each step in the design & engineering process to develop a solution to the challenge. Place a check in the box as each step is completed. Fill in the blanks when necessary. 1. Identify The Challenge Challenge: Review. 2. Brainstorm Ideas & Solutions Discuss design ideas. Consider building components and cost. 3. Build A Prototype Build a working prototype of the design. 4. Test & Improve The Design Test & improve the design for performance and consistency. New challenge discovered: Review grading rubric and design. Consider ways to reduce cost. 5. Explain The Design Prepare to demonstrate and present the design to others. Review project grading rubric. Explain any unique design features that were included. Describe at least one new problem/challenge discovered during Step 4 (Test and Improve The Design) and how the team redesigned a new solution. 5

6 Design & Engineer Challenge Evaluation When teams have completed the design & engineering challenge, it should be presented to the teacher and classmates for evaluation. Teams will be graded on the following criteria: Specifications: Does the design meet all as stated in the design brief? Performance: How well does the design work? Does it function consistently? Team Collaboration: How well did the team work together? Can each student descibe how they contributed? Design Quality/Aesthetics: Is the design of high quality? Is it structurally strong, attractive, and well proportioned? Material Cost: What was the total cost of the design? Was the team able to stay on or under budget? Presentation: How well did the team communicate all aspects of the design to others? Grading Rubric Advanced 5 Points Proficient 4 Points Partially Proficient 3 Points Not Proficient 0 Points Specifications Meets all Meets most Meets some Does not meet Performance Design performs consistently well Design performs well often Design is partially functional Design does not work Team Collaboration Every member of team contributed Most members of team contributed Some members of team contributed Team did not work together Design Quality/ Aesthetics Great design/ Good design/ Average design/ Poor design/ Material Cost On Budget ($180 or Less) Slightly Over Budget ($ ) Over Budget ($ ) Significantly Over Budget ($196+) Presentation Great presentation/ well explained Good presentation/ well explained Poor presentation/ explanation No presentation/ explanation Points Total Points /